CN1251966A - Method and apparatus for transmitting digit data signals - Google Patents
Method and apparatus for transmitting digit data signals Download PDFInfo
- Publication number
- CN1251966A CN1251966A CN99121539A CN99121539A CN1251966A CN 1251966 A CN1251966 A CN 1251966A CN 99121539 A CN99121539 A CN 99121539A CN 99121539 A CN99121539 A CN 99121539A CN 1251966 A CN1251966 A CN 1251966A
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- CN
- China
- Prior art keywords
- digital signal
- parallel
- signal
- bit digital
- bit
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5055—Laser transmitters using external modulation using a pre-coder
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/504—Laser transmitters using direct modulation
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Optical Communication System (AREA)
- Dc Digital Transmission (AREA)
Abstract
A method for converting a parallel digital signal into a serial digital signal and transmitting the same over an optical cable (8, 31, 32). The method includes coding the N-bit parallel digital signal into an (N+1)-bit parallel digital signal in which the number of inversions between neighboring bits is highest. The coded (N+1)-bit parallel digital signal is converted into a serial digital signal. The converted serial digital signal is then converted into a light signal. Then, the converted light signal is transmitted over the optical cable. A corresponding apparatus is also disclosed.
Description
The present invention relates to send the method and apparatus of digital signal, particularly parallel digital signal is converted to serial digital signal and on optical cable with the method and apparatus of its transmission.
When sending digital signal to far away when regional, the use of traditional cable has produced voltage drop because of the line resistance of cable on the signal that just is being sent out, like this, just need the line drive circuit of compensated voltage drop.And, when sending parallel digital signal,, also need to send in a large number cable material owing to need a plurality of channels, therefore, a kind of method has just appearred, parallel digital signal is changed into serial digital signal and with its method that on optical cable, sends.
Yet when sending digital signal on optical cable, when the time that signal level keeps constant extended, promptly when the quantity of DC component increased, the mistake of the received signal in the receiving system also increased.
For solving enterprising problem, the invention provides a kind of method, be used for parallel digital signal being changed into serial digital signal and it being sent on optical cable, wherein, even it is constant that the signal level that will send on the optical cable keeps, the conversion of signal level is taken place once in the plurality of data bag at least, make the quantity of DC component reduce.
For achieving the above object, the present invention includes a kind of method, be used for N parallel-by-bit digital signal being changed into serial digital signal and it being sent on optical cable.The method comprising the steps of: (1) changes into N+1 parallel-by-bit digital signal with N parallel-by-bit digital signal, and wherein the anti-phase quantity between the phase ortho position is the highest; (2) the N+1 parallel-by-bit digital signal that is encoded is changed into serial digital signal; (3) serial digital signal after will transforming changes into light signal; And (4) light signal after will transforming sends on optical cable.
According to another aspect of the present invention, this device comprises: multiplexer, be used for N parallel-by-bit digital signal encoding is become N+1 parallel-by-bit digital signal, wherein the anti-phase quantity between the phase ortho position is the highest, and the N+1 parallel-by-bit digital signal after will encoding changes into serial digital signal; One optical signal generator is used for the serial digital signal after transforming is changed into light signal and the light signal after emission transforms on the optical cable.Because multiplexer of the present invention becomes N+1 parallel-by-bit digital signal with N parallel-by-bit digital signal encoding, even it is constant that the signal level that will send on the optical cable keeps, the conversion of signal level is taken place once in the plurality of data bag at least, make the quantity of DC component reduce.
This multiplexer preferably includes: memory is used for the N+1 parallel-by-bit digital signal of memory encoding and exports N+1 parallel-by-bit digital signal corresponding to Input Address when N parallel-by-bit digital signal is transfused on the address; Walk to serial convertor in the lump, be used for the N+1 parallel-by-bit digital signal of memory output is changed into serial digital signal.
To after the preferred embodiment explanation, above-mentioned purpose of the present invention and advantage will be clearer with reference to accompanying drawing.
Fig. 1 is the block diagram according to the digital signal transmitting system of the embodiment of the invention; And
Fig. 2 is the block diagram of digital signal transmitting system when the N of device shown in Figure 1 parallel-by-bit digital signal is a vision signal.
With reference to Fig. 1, according to digital signal transmitting system of the present invention with N parallel-by-bit digital signal D
pChange into serial digital signal and afterwards it is sent on optical cable 31 and 32.Transmitting system comprises multiplexer 1 and optical signal generator 2.Multiplexer 1 is with N parallel-by-bit digital signal D
pBe encoded into N+1 parallel-by-bit digital signal, wherein the anti-phase quantity between the phase ortho position is the highest, and the N+1 parallel-by-bit digital signal of coding is changed into serial digital signal.Optical signal generator 2 is with the serial digital signal of multiplexer 1 output and the first clock signal C K that together imports with N parallel-by-bit digital signal
1Inject the light signal of optical cable 31 and 32 after changing into.
Optical signal generator 2 comprises a laser drive circuit 21 and a diode laser matrix 22 (LDA), and it is a laser generator.Laser drive circuit 21 produces drive signal corresponding to the serial digital signal from multiplexer 1 output.LDA22 produces laser signal by the drive signal of laser driver 21.The light signal that produces in LDA22 is launched in the corresponding optical cable 31 and 32, then emission.
For N parallel-by-bit digital signal D
pBe the situation of 8 signals, following will the explanation set the encryption algorithm that is stored in 9 bit data in the lut memory 11.
At first, select 9 the most frequent bit data streams of level translation between the phase ortho position, in other words, in 9 bit data streams, select to have 4 logical values, i.e. 41 and 5 logic lows, i.e. 50 first data flow and have 5 logic-high value, i.e. 51 and 4 logic low values, i.e. second data flow of 40.In 9 bits, have 41 and 50 situation equal 9! / [(4! ) (5! )].In other words, in 9 bit data streams, the quantity with first data flow of 51 and 40 is 126.Like this, because the number of states of 8 bit data streams is 256,4 the 3rd data flow and their common codings that are included in first and second data flow.4 the 3rd data flow are selected from having 31 and 60 data and/or having in 61,30 the data.For example, the 3rd data flow is (100100100), (100010100), (001001001) and (011101011).The 3rd data flow can be set secondary in some bags, further increase the generation of level translation with this.In other words, the 3rd data flow is configured to the data flow of a pair of DC of having component same magnitude and contrary sign, and is used alternatingly in some bags afterwards.For example, one of the 3rd data flow is configured to a pair of { (100100100) and (110110110) } so that alternately export corresponding to corresponding 8 bit data afterwards in some bags.
Fig. 2 is a digital signal dispensing device, and wherein the N parallel-by-bit digital signal of device shown in Figure 1 is a vision signal.
With reference to Fig. 2, personal computer 5 inputs 8 parallel-by-bit vision signal R
P1, G
P1And B
P1, the first clock signal C K
1, vertical synchronizing signal V
Sync, horizontal-drive signal H
SyncWith enable signal EN.Be included in 9 parallel-by-bit vision signal R of lut memory 61 memory encodings in the multiplexer 6
P2, G
P2And B
P2, and as 8 parallel-by-bit vision signal R
P1, G
P1And B
P1During the Input Address mouth, corresponding to Input Address it is exported by FPDP.Parallel-to-serial converter 62 is with 9 parallel-by-bit vision signal R
P2, G
P2And B
P2Change into serial video signal R
s, G
sAnd B
sClock generator 63 generations again has and 8 parallel-by-bit digital signal R
P1, G
P1And B
P1Shu Ru the first clock signal C K simultaneously
1The second clock signal CK of 9 overtones bands of frequency
2, with the operation of control parallel-to-serial converter 62.
The laser driver 71 that is included in the optical signal generator 7 produces corresponding to the serial digital video signal R by multiplexer 6 outputs
s, G
sAnd B
sDrive signal, the first clock signal C K
1With vertical synchronizing signal V
Sync, horizontal-drive signal H
SyncWith enable signal EN, they are from personal computer 5 outputs.Diode laser matrix (LDA) 72 produces laser signal by the drive signal of laser driver 71.The light signal that produces in LDA72 is injected corresponding optical cable 8, is sent to the receiving system that is positioned at monitor afterwards.Receiving system will revert to primary signal from the modification signal that dispensing device sends and use it for monitor.
As mentioned above, according to the present invention, parallel digital signal changed into serial digital signal and on optical cable with the method and apparatus of its transmission, constant even the digital signal level that will send keeps, also make signal level conversion in some bags once reduce the DC component.Like this, the signal of receiving system receives the wrong receptivity that can reduce and strengthen low frequency signal.
Those skilled in the art can make the modification in defined essence of various appended claims and the scope and substitute the present invention.
Claims (8)
1. a digital signal sending method is used for N parallel-by-bit digital signal being changed into serial digital signal and it being sent on optical cable, it is characterized in that comprising step:
(1) N parallel-by-bit digital signal is changed into N+1 parallel-by-bit digital signal, wherein the anti-phase quantity between the phase ortho position is the highest;
(2) the N+1 parallel-by-bit digital signal that is encoded is changed into serial digital signal;
(3) serial digital signal after will transforming changes into light signal; And
(4) light signal after will transforming sends on optical cable.
2. digital signal sending method as claimed in claim 1, wherein N parallel-by-bit digital signal is one 8 parallel-by-bit digital signals, and coding step (1) comprises step:
(1-1) 126 8 parallel-by-bit digital signal datas of coding stream is with corresponding to the data that have 4 logic-high value 1 and 5 logic low values 0 in the middle of 9 bit data;
(1-2) encode another 126 8 parallel-by-bit digital signal datas stream with corresponding to the data that in 9 bit data, have 5 logic-high value 1 and 4 logic low values 0; And
(1-3) data flow of 48 parallel-by-bit digital signals of coding is with corresponding to the data that have 3 logic-high value 1 and 6 logic low values 0 in 9 bit data.
3. digital signal sending method as claimed in claim 2, wherein step (1-3) comprises a pair of data flow with 8 parallel-by-bit digital signals of each one-tenth of coding 4 data flow, alternately to be used for afterwards some bags.
4. a digital signal dispensing device is used for N parallel-by-bit digital signal being changed into serial digital signal and it being sent on optical cable, it is characterized in that comprising:
Multiplexer is used for N parallel-by-bit digital signal encoding is become N+1 parallel-by-bit digital signal, and wherein the anti-phase quantity between the phase ortho position is the highest, and the N+1 parallel-by-bit digital signal after will encoding changes into serial digital signal;
Optical signal generator is used for the serial digital signal after transforming is changed into light signal and the light signal after emission transforms on the optical cable.
5 digital signal dispensing devices as claimed in claim 4, wherein multiplexer comprises:
Memory is used for the N+1 parallel-by-bit digital signal of memory encoding and exports N+1 parallel-by-bit digital signal corresponding to Input Address when N parallel-by-bit digital signal is transfused on the address;
And walk to serial convertor, be used for the N+1 parallel-by-bit digital signal of memory output is changed into serial digital signal.
6. digital signal dispensing device as claimed in claim 5, wherein multiplexer further comprises clock generator again, be used to produce the clock signal of the N+1 overtones band of frequency, with the operation of control parallel-to-serial converter with another clock signal of importing jointly with N parallel-by-bit digital signal.
7. digital signal dispensing device as claimed in claim 4, wherein N parallel-by-bit digital signal each be red, green, blue vision signal.
8. digital signal dispensing device as claimed in claim 4, wherein optical signal generator comprises:
Be used to produce laser driver corresponding to the drive signal of the serial digital signal of exporting by multiplexer; And
Produce the diode laser matrix of laser signal by the drive signal of laser driver.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980043358A KR100359088B1 (en) | 1998-10-16 | 1998-10-16 | Method and apparatus for sending digital signal |
| KR43358/1998 | 1998-10-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1251966A true CN1251966A (en) | 2000-05-03 |
Family
ID=19554275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99121539A Pending CN1251966A (en) | 1998-10-16 | 1999-10-15 | Method and apparatus for transmitting digit data signals |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1001346A2 (en) |
| JP (1) | JP2000188619A (en) |
| KR (1) | KR100359088B1 (en) |
| CN (1) | CN1251966A (en) |
| TW (1) | TW449981B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100417029C (en) * | 2002-04-03 | 2008-09-03 | 三星电子株式会社 | Serializer-deserializer circuit possessing enlarged building-up and retention time tolerance |
| US7768306B2 (en) | 2006-09-20 | 2010-08-03 | Mediatek Inc. | Low to high voltage conversion output driver |
| CN110365418A (en) * | 2019-07-11 | 2019-10-22 | 山东翎彬信息科技有限公司 | A kind of ultrasound information transmission method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100319856B1 (en) * | 1998-11-04 | 2002-02-19 | 윤종용 | Video signal transmitter |
| KR100845141B1 (en) * | 2007-01-17 | 2008-07-10 | 삼성전자주식회사 | Single rate interface device, dual rate interface device and dual rate interfacing method |
-
1998
- 1998-10-16 KR KR1019980043358A patent/KR100359088B1/en not_active IP Right Cessation
-
1999
- 1999-10-14 JP JP11292876A patent/JP2000188619A/en active Pending
- 1999-10-14 EP EP99308127A patent/EP1001346A2/en not_active Withdrawn
- 1999-10-15 CN CN99121539A patent/CN1251966A/en active Pending
- 1999-12-31 TW TW088117461A patent/TW449981B/en not_active IP Right Cessation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100417029C (en) * | 2002-04-03 | 2008-09-03 | 三星电子株式会社 | Serializer-deserializer circuit possessing enlarged building-up and retention time tolerance |
| US7768306B2 (en) | 2006-09-20 | 2010-08-03 | Mediatek Inc. | Low to high voltage conversion output driver |
| CN101150321B (en) * | 2006-09-20 | 2012-03-21 | 联发科技股份有限公司 | Output drive circuit, signal conversion method and parallel-to-serial transmitter |
| CN110365418A (en) * | 2019-07-11 | 2019-10-22 | 山东翎彬信息科技有限公司 | A kind of ultrasound information transmission method |
| CN110365418B (en) * | 2019-07-11 | 2022-04-29 | 山东研诚信息科技有限公司 | Ultrasonic information transmission method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000188619A (en) | 2000-07-04 |
| KR100359088B1 (en) | 2002-12-18 |
| KR20000026007A (en) | 2000-05-06 |
| TW449981B (en) | 2001-08-11 |
| EP1001346A2 (en) | 2000-05-17 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |